JPH02150527A - Damper coupling of engine with separate accessories - Google Patents

Abstract

PURPOSE:To prevent the generation of abnormal sound by providing a spline connecting portion comprising a spline shaft, a hub having a hole where the spline shaft is fitted, a housing having the same axis as that of the hub, and an elastic member interposed between the rotation transmitting projection of the hub and a rotation receiving projection of the housing. CONSTITUTION:When a propeller shaft 13 is rotated by an engine, the rotation is transmitted through a spline shaft 21 to a hub 22, and further transmitted to a common output shaft 16 by a rotation transmitting projection 24 of the hub 22 and a rotation receiving projection 28 of an output shaft housing 27. When the torque of the shaft 21 changes smoothly, one of rubber members 30 is always compressed so that the tooth surface of the shaft 21 and the tooth surface of a spline hole 23 contact each other only at one surface in the circumferential direction not to produce abnormal sound. On the contrary, when the rotating speed of an engine reaches near the resonance point, large rotational fluctuation is caused in the shaft 21, and at this time, the rubber members 30 are alternately compressed to absorb energy of the rotational fluctuation, and the rubber members 31 absorb radial vibration to prevent the generation of abnormal sound between the shaft 21 and the hole 23.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a coupling used when an engine and an auxiliary machine are placed apart and are coupled together via a propeller shaft.

``Prior art and its problems'' For example, if the space for installing an engine is narrow, the engine may be placed at the rear and auxiliary equipment such as a cooler compressor, power steering pump, alternator, etc. The two are connected via a propeller shaft. When such a power transmission system is used, a spline joint is usually interposed in a part of the transmission system in order to absorb vibrations in the axial direction of the output shaft due to engine vibrations.

A conventional example will be explained based on FIG. The output shaft 12 of the engine 11 has a pair of universal joints 13a, 13.
It is coupled to a propeller shaft 13 having a b. The propeller shaft 13 is connected to a common rotation shaft 16 of the auxiliary equipment unit 15 via a spline joint 14, and the rotation of the common rotation shaft 16 is controlled by the pulleys 17a to 17e and the belt 1.
8a and 18b, the power is transmitted to the cooling fan 19a1, the car cooler compressor 19b, and the power steering pump 19c. The rotation speeds of these auxiliary machines are set by the diameters of the pulleys 17a to 17e.

The spline joint 14 has a spline shaft 14a fitted into a spline hole 14b so as to be movable in the axial direction, and axial vibrations of the engine 11 are absorbed by the spline joint 14.

However, the engine 11 has rotational fluctuations, which causes resonance in the propeller shaft. At the time of resonance, the shaft 14a of the spline joint 14 and the tooth surface of the hole 14b repeatedly come into contact with each other violently, which may generate abnormal noise.

The torsional damper of Utility Model Application No. 53-160561 is
Although the purpose is to buffer torque fluctuations, it cannot be directly applied to prevent abnormal noise caused by resonance of the propeller shaft. Also, Utsukai Showa 62-14874
The structure of the power take-off shaft of the water-cooled engine No. 6 does not have a spline shaft, and similarly cannot be used to solve the above problems.

"Object of the Invention" The present invention provides an engine with separate auxiliary equipment,
It is an object of the present invention to obtain a damper coupling that can prevent the occurrence of abnormal noise in a spline joint due to rotational fluctuations of an engine.

"Summary of the Invention" The present invention was completed based on the idea of absorbing engine torque fluctuations by elastic deformation of an elastic member. In a separate auxiliary engine in which at least one part is a spline connection, the spline connection part is connected to a hub having a spline shaft, a spline hole into which the spline shaft is fitted, and a rotation transmission protrusion projecting radially outward. a housing having a rotation receiving protrusion coaxial with the hub and protruding radially inward and capable of engaging with the rotation transmitting protrusion; an elastic member interposed between the rotation transmitting protrusion of the hub and the rotation receiving protrusion of the housing; One of the spline shaft and the housing is connected to the engine or an auxiliary machine, and the other is connected to the propeller shaft.

According to the present invention, when output fluctuations occur due to fluctuations in engine rotation, the elastic member between the rotation transmitting protrusion and the transmitted protrusion deforms and absorbs the fluctuation, thereby preventing the occurrence of abnormal noise due to collision between the spline shaft and the hole. This makes it possible to extract output rotation with reduced rotational fluctuations. Further, even if some noise is generated at the spline joint, transmission of the noise to the auxiliary unit can be reduced by using the elastic member.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. 1 and 2 show a first embodiment of the present invention. In this embodiment, a damper coupling 20 of the present invention is used in place of the spline joint 14 of FIG. 5. An input spline shaft 21 is attached to the end of the propeller shaft 13.
The input spline shaft 21 is spline-fitted into a spline hole 23 formed in the shaft portion of the hub 22. With this spline connection, engine 1
The fact that the vibration in the axial direction of No. 1 is absorbed is the same as in the conventional example shown in FIG.

The hub 22 has a plurality of rotation transmission protrusions 24 formed on its outer periphery and protrudes radially outward. On the other hand, a common rotating shaft 16 rotatably supported by a holding sleeve 25 of the auxiliary equipment unit 15 via a bearing 26 has pulleys 17a and 17b at one end thereof, and a pulley located on the outer periphery of the hub 22 at the other end. It integrally has a cylindrical output shaft housing 27.

The output shaft housing 27 is integrally formed with a rotation receiving projection 28 that projects radially inward and extends between the rotation transmission projections 24 of the hub 22 . Both the rotation transmitting projection 24 and the rotation receiving projection 28 have fan-shaped cross sections perpendicular to the axis.

Rubber members 30 are inserted into gaps on both sides in the circumferential direction formed between both protrusions 24 and 28. Further, a rubber member 31 is similarly inserted into the gap between the radial outer surface of the rotation transmission projection 24 and the inner surface of the output shaft housing 27, and between the rubber members 30 and 31, there is a gap between the two. A discontinuous portion (space) 32 is provided to facilitate elastic deformation. It is desirable that the rubber members 30 and 31 be bonded to the outer surface of the rotation transmitting projection 24 or the inner surface of the rotation receiving projection 28 during vulcanization.

In this damper coupling configured as described above, when the propeller shaft 13 is rotated by the engine 11, the rotation is transmitted to the hub 22 via the input spline shaft 21, and the rotation transmission protrusion 24 of the hub 22 and the output shaft housing 27.
The output shaft housing 27,
In other words, it is transmitted to the common rotating shaft 16. In this rotation transmission path, immediately after the input spline shaft 21 starts rotating and when the torque of the input spline shaft 21 changes smoothly, the gap between the rotation transmission protrusion 24 and the rotation receiving protrusion 28 on both sides in the circumferential direction is One of the intervening rubber members 30 is always compressed, and the other is not always compressed. In this state, the tooth surfaces of the input spline shaft 21 and the tooth surfaces of the spline hole 23 are in contact with each other only on one surface in the circumferential direction, and no abnormal noise is generated.

On the other hand, when the rotational speed of the engine 11 reaches near the resonance point, a large rotational fluctuation occurs in the input spline shaft 21. Then, the input spline shaft 21 vibrates within the clearance with the spline hole 23, but the rubber members 30 and 31 absorb this vibration due to their elasticity. That is, when a rotational fluctuation occurs in the input spline shaft 21, the rubber members 30 interposed in the gaps on both sides in the circumferential direction between the rotation transmission protrusion 24 and the rotation receiving protrusion 28 are compressed alternately.
During this compression process, the energy of rotational fluctuations is absorbed. The rubber member 31 absorbs vibrations of the input spline shaft 21 in the radial direction. Therefore, generation of abnormal noise between the input spline shaft 21 and the spline hole 23 can be prevented or suppressed.

Note that the damper coupling 20 is installed on the auxiliary unit 15 of the universal joint 13b rather than on the engine ll side of the universal joint 13a.
Installing it on the side is more effective in preventing abnormal noise. The reason for this is that in the case of the former, some abnormal noise from the universal joint remains, which may be amplified by the auxiliary unit 15, whereas in the case of the latter mounting position, the noise generated by the universal joint, etc. Rubber member 30.3 also makes abnormal noise
It is thought that absorption is possible at 1.

In addition, as shown in Fig. 3, the mounting direction of the damper coupling is such that the input spline shaft 21 of the propeller shaft 13 and the spline hole 23 of the hub 22 are spline-fitted. This is desirable because sound can be absorbed by the rubber members 30 and 31.

FIG. 6 shows an example of the relationship between the engine speed and the noise level of the spline section. The solid line is a conventional spline connection. The dashed line is an example of a damper coupling according to the invention.

3 and 4 show a second embodiment of the present invention. The damper coupling 2OA of this embodiment has a hub 2
24A of radially outward rotation transmission protrusions formed at 2;
The shape of the radially inward rotation receiving protrusion 28A formed on the output shaft housing 27 and the shape of the rubber member 34 inserted between them are different; other parts are the same as the first embodiment. It is. Identical parts are given the same reference numerals.

The rotation transmitting protrusion 24A and the rotation receiving protrusion 28A have widths that become narrower toward their tips, and form substantially cylindrical surfaces 35 and 36 at their bases. And the genius cylindrical surfaces 35 and 3 of the adjacent rotation transmitting protrusion 24A and rotation receiving protrusion 28A
A rubber cylinder 34 is inserted between 6 and 6. This rubber cylinder 34 simultaneously comes into elastic contact with the rotation transmitting projection 24A, the rotation receiving projection 28A, the inner circumferential surface of the output shaft housing 27, and the outer circumferential surface of the hub 22. In this embodiment, a bearing 38 is provided between the output shaft housing 27 and the hub 220 to allow relative rotation therebetween, but a similar bearing may be provided in the second embodiment as well.

According to this second embodiment, the elasticity of the rubber cylinder 34 can absorb vibrations in the circumferential direction and radial direction of the input spline shaft 21, and even if the rotational torque of the input spline shaft 21 fluctuates, The occurrence of abnormal noise due to collision between the input spline shaft 21 and the spline hole 23 can be prevented or suppressed.

``Effects of the Invention'' As described above, the present invention provides an engine with separate auxiliary equipment in which an engine and an auxiliary equipment are connected via a propeller shaft, and at least one part of the connection part is a spline connection. A hub is interposed between the spline shaft serving as the output shaft and the housing, and the hub is provided with a spline hole and a radial rotation transmission protrusion, and the housing is provided with a radial rotation transmission protrusion that can be engaged with the rotation transmission protrusion. Since a receiving projection is provided and an elastic member is interposed between the two projections,
Fluctuations in engine rotation can be absorbed and extracted by the elastic member. Therefore, it is possible to prevent abnormal noise from occurring at the spline joint, and to eliminate adverse effects on durability such as fretting.

[Brief explanation of the drawing]

FIG. 1 is a sectional view taken along line I-I in FIG. 2, showing a first embodiment of a damper coupling according to the present invention; FIG. 2 is a sectional view taken along line nn in FIG. 3 is a sectional view taken along line III-III in FIG. 4, showing a second embodiment of the present invention; FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;
FIG. 5 is a front view showing a rotation transmission system between an engine and an auxiliary machine using a spline joint, and FIG. 6 is a graph showing the relationship between engine rotation speed and sound pressure level. DESCRIPTION OF SYMBOLS 11... Engine, 12... Output shaft, 13... Propeller shaft, 15... Auxiliary equipment unit, 16...
Common rotating shaft (output shaft), 20.2OA...damper coupling, 21...input spline shaft, 22...hub, 23...spline hole, 24.24A...rotation transmission bundle origin, 27...Output shaft housing, 28.28A
...Rotation receiving projection, 30.31...Rubber member (elastic member), 34...Rubber cylinder (elastic member). Patent applicant: Toyota Motor Corporation, Taitoyo Kogyo Co., Ltd., agent: Kunio Miura

Claims (1)

[Claims] (1) In an engine with separate auxiliary equipment in which the engine and the auxiliary equipment are connected via a propeller shaft, and at least one of the joint parts is a spline joint, the spline joint part is connected to a spline shaft; this spline shaft is fitted. a hub having a mating spline hole and a radially outwardly projecting rotation transmitting projection; a housing having a radially inwardly projecting rotation receiving projection that is coaxial with the hub and engageable with the rotation transmitting projection; An elastic member is provided between the rotation transmission protrusion of the hub and the rotation receiving protrusion of the housing, and one of the spline shaft and the housing is connected to an engine or an auxiliary machine, and the other is connected to a propeller shaft. A damper coupling for an engine with separate auxiliary equipment.